<style id="elementor-post-1942">.elementor-1942 .elementor-element.elementor-element-863e822{margin-top:-20px;margin-bottom:0px;}.elementor-1942 .elementor-element.elementor-element-40a68c8 > .elementor-widget-wrap > .elementor-widget:not(.elementor-widget__width-auto):not(.elementor-widget__width-initial):not(:last-child):not(.elementor-absolute){margin-block-end:5px;}.elementor-1942 .elementor-element.elementor-element-40a68c8 > .elementor-element-populated{padding:0px 0px 20px 0px;}.elementor-1942 .elementor-element.elementor-element-d042341 .elementor-button{background-color:#FFFEE0;fill:#C00000;color:#C00000;padding:0px 0px 0px 0px;}.elementor-1942 .elementor-element.elementor-element-d042341 .elementor-button-content-wrapper{flex-direction:row-reverse;}.elementor-1942 .elementor-element.elementor-element-d042341 .elementor-button:hover, .elementor-1942 .elementor-element.elementor-element-d042341 .elementor-button:focus{color:#000000;}.elementor-1942 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.elementor-divider{padding-block-start:15px;padding-block-end:15px;}</style>{"id":1942,"date":"2021-08-16T09:39:04","date_gmt":"2021-08-16T07:39:04","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=1942"},"modified":"2025-08-18T13:18:25","modified_gmt":"2025-08-18T11:18:25","slug":"nueva-vulnerabilidad-dia-cero-en-print-spooler-de-microsoft-windows","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/nueva-vulnerabilidad-dia-cero-en-print-spooler-de-microsoft-windows\/","title":{"rendered":"Nueva vulnerabilidad d\u00eda cero en Print Spooler de Microsoft Windows"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"1942\" class=\"elementor elementor-1942\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-863e822 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"863e822\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-40a68c8\" data-id=\"40a68c8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9ba848b elementor-widget elementor-widget-shortcode\" data-id=\"9ba848b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\"><span style=\"color: #c02b23;font-weight: bold\">Cr&iacute;tica <\/span><img loading=\"lazy\" decoding=\"async\" width=\"10\" height=\"10\" src=\"https:\/\/www.infordisa.com\/soc\/imgs\/alerta-5.png\" alt=\"Alerta 5\"\/><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d042341 elementor-widget elementor-widget-button\" data-id=\"d042341\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2021-36958\" target=\"_blank\" rel=\"nofollow\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-external-link-alt\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">CVE-2021-36958<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-64ac3c5 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"64ac3c5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-e5e4e52 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"e5e4e52\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1e03f3a\" data-id=\"1e03f3a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b01688c elementor-alert-success elementor-widget elementor-widget-alert\" data-id=\"b01688c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Actualizaci&oacute;n 14\/9\/2021<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\"> Microsoft ha anunciado que lanzar&aacute; las actualizaciones de seguridad de septiembre de 2021 para todas las versiones afectadas de Windows para solventar esta <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a>. Microsoft ha eliminado las soluciones provisionales porque ya no son aplicables.<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d77a425 elementor-widget elementor-widget-text-editor\" data-id=\"d77a425\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Este agosto Microsoft ha publicado un aviso de seguridad fuera de banda que reconoce la existencia de<strong> otra vulnerabilidad de Print Spooler (<a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/cve\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>CVE<\/a>-2021-36958)<\/strong>.<\/p><p>El servicio Print Spooler es uno de los componentes m&aacute;s antiguos de Windows y su c&oacute;digo tiene al menos 20 a&ntilde;os y ha comenzado a ser examinado cada vez m&aacute;s por investigadores y atacantes.<\/p><p>Una vulnerabilidad en el servicio fue explotada hace m&aacute;s de una d&eacute;cada por los atacantes de Stuxnet y, desde entonces, ha habido un flujo constante de nuevos descubrimientos, como PrintDemon y <a href=\"https:\/\/www.infordisa.com\/soc\/microsoft-publica-el-parche-para-la-vulnerabilidad-print-nightmare\/\">PrintNightmare<\/a>.<\/p><h2><span style=\"color: #c00000;\">&iquest;Qu&eacute; provoca?<\/span><\/h2><p>Es una <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/vulnerabilidad\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">vulnerabilidad<\/a> de ejecuci&oacute;n remota de c&oacute;digo que existe cuando el servicio Windows Print Spooler realiza incorrectamente operaciones de archivos privilegiados.<\/p><p>Un atacante que aproveche con &eacute;xito esta vulnerabilidad podr&iacute;a ejecutar c&oacute;digo arbitrario con privilegios de SISTEMA. Entonces, un atacante podr&iacute;a instalar programas; ver, cambiar o eliminar datos; o crear nuevas cuentas con todos los derechos de usuario.<\/p><h2><span style=\"color: #c00000;\">&iquest;Qu&eacute; podemos hacer?<\/span><\/h2><p><span style=\"text-decoration: line-through;\">Por el momento, no existe arreglo por parte de Microsoft. Pero se indica esta soluci&oacute;n alternativa:<\/span><\/p><p><span style=\"color: #339966;\"><strong>A partir del 14\/9\/2021 las actualizaciones ya solucionan el problema. No har&aacute; falta desactivar la cola de impresi&oacute;n.<\/strong><\/span><\/p><p><strong>Determinar si el servicio de cola de impresi&oacute;n se est&aacute; ejecutando para detenerlo y desactivarlo<\/strong><\/p><p>Para hacer esto, primero hay que ejecutar lo siguiente en Windows PowerShell:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ea80c2e elementor-widget elementor-widget-code-highlight\" data-id=\"ea80c2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-solarizedlight copy-to-clipboard \">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-typescript \">\n\t\t\t\t<code readonly class=\"language-typescript\">\n\t\t\t\t\t<xmp>Get-Service -Name Spooler<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9e536b4 elementor-widget elementor-widget-text-editor\" data-id=\"9e536b4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Si la cola de impresi&oacute;n se est&aacute; ejecutando o si el servicio no est&aacute; todav&iacute;a deshabilitado, hay que seguir estos pasos, ejecutar lo siguiente en Windows PowerShell:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-326137f elementor-widget elementor-widget-code-highlight\" data-id=\"326137f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"code-highlight.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"prismjs-solarizedlight copy-to-clipboard \">\n\t\t\t<pre data-line=\"\" class=\"highlight-height language-typescript \">\n\t\t\t\t<code readonly class=\"language-typescript\">\n\t\t\t\t\t<xmp>Stop-Service -Name Spooler -Force\r\n\r\nSet-Service -Name Spooler -StartupType Disabled<\/xmp>\n\t\t\t\t<\/code>\n\t\t\t<\/pre>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-127ae2e elementor-widget elementor-widget-text-editor\" data-id=\"127ae2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong>Esta medida impedir&aacute; la impresi&oacute;n en local y como <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/glosario-definicion\/servidor\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>servidor<\/a> de impresi&oacute;n<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9ff3133 elementor-alert-danger elementor-widget elementor-widget-alert\" data-id=\"9ff3133\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Recomendaci&oacute;n<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\">Para tener los sistemas inform&aacute;ticos seguros y estables, recomendamos tener siempre todo el <strong>software actualizado y tomar las medidas correctivas oportunas<\/strong>.<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Actualizaci&oacute;n 14\/9\/2021 Microsoft ha anunciado que lanzar&aacute; las actualizaciones de seguridad de septiembre de 2021 para todas las versiones afectadas<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[4],"tags":[36],"class_list":["post-1942","post","type-post","status-publish","format-standard","hentry","category-alertas-de-seguridad","tag-windows","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Nueva vulnerabilidad d\u00eda cero en Print Spooler de Microsoft Windows - 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